We compare our proposal (called “FGAMM” in the following) – combining two-step FPCA with our (in)complete curve registration –
with the earlier approach of [1]} (“varEM”)
– using an identical registration approach combined with a variational EM-based FPCA –
and the joint SRVF approach of [2]} (Algorithm 4.1, “SRVF”) which combines
the SRVF registration of [3]} with the vertical fPCA introduced in
[4]}.
The latter approach is only applied to complete curve settings since the software
implementation available at the time of writing [5]} is not able to handle
incomplete curves.
